CCA-treated wood

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Transport and interaction of arsenic, chromium, and copper in soil associated with CCA-treated wood

Journal Title, Volume, Page: 
Chemosphere, 78(8), pp: 989-995
Year of Publication: 
2010
Authors: 
Ligang Hu
Department of Chemistry & Biochemistry, Florida International University, University Park, Miami, FL 33199, United States
Cristina Diez-Rivas
Department of Chemistry & Biochemistry, Florida International University, University Park, Miami, FL 33199, United States
A. Rasem Hasan
Department of Civil, Architectural and Environmental Engineering, University of Miami, Coral Gable, FL 33124, United States
Current Affiliation: 
Department of Civil Engineering, An-Najah National University, P.O. Box 7, Nablus, Palestine.
Helena Solo-Gabriele
Department of Civil, Architectural and Environmental Engineering, University of Miami, Coral Gable, FL 33124, United States
Lynne Fieber
Division of Marine Biology and Fisheries, Rosenstiel School of Marine & Atmospheric Science, University of Miami, FL 33149, United States
Yong Cai
Department of Chemistry & Biochemistry, Florida International University, University Park, Miami, FL 33199, United States
Preferred Abstract (Original): 
Laboratory column leaching experiments were conducted to investigate the transport and interaction of As, Cr, and Cu associated with CCA-treated wood in sand with and without peat amendment. Results showed that leaching behavior of As, Cr, and Cu in these substrates were totally different. Substrate characteristics and microorganism activity posed distinct effects on the transport and transformation of these three elements. Arsenic was rapidly leached out from the columns with or without the amendment of peat, while Cr remained in all columns during the entire experimental period (215 d). Copper was leached out only in the substrate column without peat. The presence of microorganism clearly facilitated the transport of As, while it did not show obvious effects on the transport of Cr and Cu. Interactions among these three elements were observed during the processes of adsorption and transport. The adsorption of Cu on soil was enhanced with the adsorption of As, likely caused by a more negatively charged soil surface because of As adsorption. The adsorption of Cr on soil increased the adsorption of As due to the additional As binding sites induced by Cr adsorption. These results suggest that As concentrations in the soil affected by CCA-treated wood could largely exceed predictions based on soil adsorption capacity for As. The evaluation of the impact on human health associated with CCA-treated wood should take consideration of the distinct transport characteristics of three elements and their interactions in soils.
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